<template>
	<div>
		<!-- 面包屑导航区域 -->
	    <el-breadcrumb separator-class="el-icon-arrow-right">
	      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
	      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
	      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
	    </el-breadcrumb>

	    <!--卡片视图-->
	    <el-card>
	    	<!-- 提示区域 -->
	    	<el-alert title="添加商品信息" type="info" show-icon center :closable="false"></el-alert>
	    	<!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
			  <el-step title="基本信息"></el-step>
	          <el-step title="商品参数"></el-step>
	          <el-step title="商品属性"></el-step>
	          <el-step title="商品图片"></el-step>
	          <el-step title="商品内容"></el-step>
	          <el-step title="完成"></el-step>
			</el-steps>

			<!-- tab栏区域 -->
			<!--用表单包裹-->
			<el-form :model="addForm" status-icon :rules="addFormRules" ref="ruleForm" label-width="100px" label-position="top">
			  <el-tabs :tab-position="tabPosition" v-model="activeIndex" @tab-click="tabClicked" :before-leave="beforeTabLeave">
			    <el-tab-pane label="基本信息" name="0">
                  <el-form-item label="商品名称" prop="goods_name">
		            <el-input v-model="addForm.goods_name"></el-input>
		          </el-form-item>
		          <el-form-item label="商品价格" prop="goods_price">
	                <el-input v-model="addForm.goods_price" type="number"></el-input>
	              </el-form-item>
	              <el-form-item label="商品重量" prop="goods_weight">
		            <el-input v-model="addForm.goods_weight" type="number"></el-input>
		          </el-form-item>
		          <el-form-item label="商品数量" prop="goods_number">
		            <el-input v-model="addForm.goods_number" type="number"></el-input>
		          </el-form-item>
		          <el-form-item label="商品分类" prop="goods_cat">
		          	<!--只允许它选中三级商品分类-->
	                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
	                </el-cascader>
	              </el-form-item>
			    </el-tab-pane>
			    <el-tab-pane label="商品参数" name="1">
                  <el-form-item :label="item.attr_name" v-for="(item, i) in manyTableData" :key="item.attr_id"  >
                  	<el-checkbox-group v-model="item.attr_vals">
				      <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
				    </el-checkbox-group>
                  </el-form-item>
			    </el-tab-pane>
			    <el-tab-pane label="商品属性" name="2">
                  <el-form-item :label="item.attr_name" v-for="(item, i) in onlyTableData" :key="item.attr_id"  >
                    <el-input v-model="item.attr_vals"></el-input>	
                  </el-form-item>
			    </el-tab-pane>
			    <el-tab-pane label="商品图片" name="3">
			    	<el-upload
					  :action="actionURL"
					  :on-preview="handlePreview"
					  :on-remove="handleRemove"
					  :on-success="handleSuccess"
					  :headers="headerObj"
					  list-type="picture">
					  <el-button size="small" type="primary">点击上传</el-button>
					  <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
					</el-upload>
			    </el-tab-pane>
			    <el-tab-pane label="商品内容" name="4">
                  <quill-editor
				    ref="quillEditor"
				    class="editor"
				    v-model="addForm.goods_introduce"
				  />
				  <!--添加商品的按钮-->
				  <el-button type="primary" class="addbut" @click="addGoods">添加商品</el-button>
			    </el-tab-pane>
			  </el-tabs>
			</el-form>
			<!--图片展示对话框-->
			<el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
			   <img :src="previewPath" alt="" class="previewImg">
			</el-dialog>

	    </el-card>
	</div>
</template>
<script>
import _ from 'lodash'
export default {
	data () {
		return {
			activeIndex: '0',
			tabPosition: 'left',
			// 添加商品数据对象
			addForm: {
				goods_name: '',
		        goods_price: 0,
		        goods_weight: 0,
		        goods_number: 0,
		        goods_cat: [],
		        // 商品的介绍
		        goods_introduce: '',
		        // 图片的临时对象
		        pics: [],
		        // 商品参数 包括动态参数和静态参数
		        attrs: []
			},
			// 添加商品表单验证对象
			addFormRules: {
				goods_name: [
                  { required: true, message: "请输入商品名称", trigger: 'blur'}
				],
				goods_price: [
                  { required: true, message: "请输入商品价格", trigger: 'blur'}
				],
				goods_weight: [
		          { required: true, message: '请输入商品重量', trigger: 'blur' }
		        ],
		        goods_number: [
		          { required: true, message: '请输入商品数量', trigger: 'blur' }
		        ],
		        goods_cat: [
		          { required: true, message: '请选择商品分类', trigger: 'blur' }
		        ]
			},
			// 商品所有分类数组
			catelist: [],
            // 校验规则
			cateProps: {
              label: 'cat_name',
              value: 'cat_id',
              children: 'children'
			},
            // 动态参数列表数据
            manyTableData: [],
            onlyTableData: [],
            actionURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            headerObj: {
            	Authorization: window.sessionStorage.getItem('token')
            },
            // 控制图片预览对话框开关
            previewDialogVisible: false,
            // previewPath 预览图片路径
            previewPath: ''
		}
	},
	created () {
		this.getCateList()
	},
	methods: {
		async tabClicked () {
			// 获取商品参数列表
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
            	
            	const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            		params: { sel: 'many' }
            	})
            	if (res.meta.status !== 200) {
            		return this.$message.error('获取商品参数列表失败')
            	}
            	console.log(res.data)
            	res.data.forEach(item => {
            		item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            	})
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
            	// 证明访问的是静态参数面板
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            		params: { sel: 'only' }
            	})
            	if (res.meta.status !== 200) {
            		return this.$message.error('获取静态属性失败！')
            	}
            	console.log(res.data)
            	this.onlyTableData = res.data
            } 
			
		},
		async getCateList() {
	      const { data: res } = await this.$http.get('categories')

	      if (res.meta.status !== 200) {
	        return this.$message.error('获取商品分类数据失败！')
	      }
          
	      this.catelist = res.data
	      
	    },
	    beforeTabLeave (activeName, oldActiveName) {
	    	// activeName 即将前往的新选项卡
	    	// oldActiveName 即将离开的旧选项卡
	    	// oldActiveName 的值为string类型
	    	if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
	    		
	    		this.$message.error('请选择商品分类')
	    		return false
	    	}
	    },
	    // 控制级联选择器的选择范围 不能只选中第一级或第二级，必须是三级分类
	    handleChange () {
	    	if (this.addForm.goods_cat.length !== 3) {
	    		this.addForm.goods_cat = []
	    	}
	    },
	    // 点击文件列表中已上传的文件时的钩子
	    handlePreview (file) {
          console.log(file)
          this.previewPath = file.response.data.url
          this.previewDialogVisible = true
	    },
	    // 文件列表移除文件时的钩子
	    handleRemove (file) {
          // 移除图片是还需要在addForm.pics中移除相应的项
          // 找到对应的下标 然后删除
          const i = this.addForm.pics.findIndex(x => x.pic === file.response.data.url )
         
          this.addForm.pics.splice(i,1)
	    },
	    // 文件上传成功时的钩子
	    handleSuccess (response) {
	      // 1. 拼接得到一个图片信息对象
	      const picInfo = { pic: response.data.url }
	      // 2. 将图片信息对象，push 到pics数组中	
	      this.addForm.pics.push(picInfo)
	    },
	    // 添加商品
	    addGoods () {
	    	// 验证表单选项时候合法
	    	this.$refs.ruleForm.validate(async valid => {
	    		if (!valid) {
	    			return this.$message.error('请填写完整信息')
	    		}
	    		// 处理动态参数
	    		this.manyTableData.forEach(item => {
	    			const newInfo = {
	    				attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(',')
	    			}
	    			this.addForm.attrs.push(newInfo)
	    		})
	    		// 处理静态参数
	    		this.onlyTableData.forEach(item => {
	    			const newInfo = {
	    				attr_id: item.attr_id,
	    				attr_value: item.attr_vals
	    			}
	    			this.addForm.attrs.push(newInfo)
	    		})
	    		const form = _.cloneDeep(this.addForm)
	    		form.goods_cat = form.goods_cat.join(',')
	    		form.attrs = this.addForm.attrs
	    		console.log(form)
                //发送网络请求 商品名必须唯一存在
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                	return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
	    	})
	    }
	},
	// 动态获取三级分类Id
    computed: {
    	cateId () {
    		if (this.addForm.goods_cat.length === 3) {
    			return this.addForm.goods_cat[2]
    		}
    		return null
    	}
    }
}	
</script>
<style>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg{
	width: 100%;
}

</style>
